you forgot Tortoise Shield! like all the Imp gear, it absorbs Water.
Let's be honest, you probably use Kappa less than Edgar's Air Anchor!
Thunder Shield has the best elemental protection of the three shields, and it's absurd how good it is.
I actually dislike, if not just hate, the Thunder Shield.
It's great when you have no resistances, and that's the best props I'd give it, but it sucks when it counts for me.
Thunder Shield is not that handy with the Minerva (you only get Thunder absorb as the prime benefit).. and it primarily shares a pair of the Force Armor benefits.
I forgot to mention the Cat's Hood... a great matchup with the Ice Shield. Thunder Shield provides the extra Wind immunity, but shares too much of the other pair of existing elementals...
Ultimately, Fire protection is of utmost important to me.. which is where my primary bias lies with.
Here's a few reasons..
1) Fire perhaps is the most used elemental in the game (I need to run an actual count to be sure though)... Flare Star, N. Cross (or was it S. Cross), and many others
2) One status was built to make you use Fire.